Weldability and Microstructural Aspects of Shielded Metal Arc Welded HSLA-100 Steel Plates.

Dhua, S. K.; Mukerjee, D.; Sarma, D. S.

doi:10.2355/isijinternational.42.290

Cited by 37 publications

(19 citation statements)

References 17 publications

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“…No such increase was observed, however, for the steels and conditions studied in the current work ( Figure 5). A similar result was presented by Dhua et al [29] for a quenched and tempered HSLA100 steel of 14-mm thickness, with 0.04 pct C, 0.87 pct Mn, 0.25 pct Si, 0.5 pct Cr, 3.54 pct Ni, 0.57 Mo pct, and 0.038 pct Nb, after welding at a heat input of 2 kJ/mm.…”

Section: Haz Hardness and Tensile Propertiessupporting

confidence: 87%

High-strength steel development for pipelines: A brazilian perspective

Bott

Souza

Teixeira

et al. 2005

Metall Mater Trans A

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The production of American Petroleum Institute (API) class steels using the traditional controlled rolling route rather than the process involving accelerated cooling necessitates a careful adjustment of steel composition associated with the optimization of the rolling schedule for the deformation and phase transformation characteristics of these modified alloys. The current work presents a study of two, NbCr and NbCrMo, steel systems. The microstructure obtained is correlated not only with the resulting mechanical properties, but also with the weldability and resistance to damage in the aggressive environments to which the materials are exposed. The evaluation of the steels was undertaken at two stages along the production route, sampling the material as plate and as tubular product, according to the API 5L 2000 standard. Tensile testing, Charpy-V impact testing, and hardness measurements were used to determine the mechanical properties, and microstructural characterization was performed by optical and scanning electron microscopy. The results showed that it was possible to obtain good impact properties, for both steels, in plate and tube formats. The Charpy-V impact energy, measured at Ϫ20 °C from 100 to 250 J corresponds to a toughness level above that required by the API 5L 2000 standard, which specifies 68 to 101 J at 0 °C. The yield strength (YS) to ultimate tensile strength (UTS) ratio was determined to be 0.8, the API standard establishing a maximum limit of 0.93. Both of the alloys investigated exhibited a bainitic microstructure and were successfully processed to fabricate tubular products by the "UOE" (bending in "U", closing in "O," and expanding "E") route. With regard to weldability, the two experimental steels exhibited a heat-affected zone (HAZ) for which toughness levels (using the temperature associated with a 100 J impact energy as a base for comparison) were higher than those for both the base metal (BM) and the weld metal (WM) itself. In order to perform the evaluation of the behavior of the steels in an aggressive environment, more specifically their resistance to the deleterious effects of H 2 S, slow strain rate tests (SSRTs) were carried out, immersing the samples in a sodium thiosulfate solution during the tests. Though no secondary cracking was observed in the test samples, the ductility levels measured were lower than those for the same materials tested in air. Constant load tests were also conducted according to the standard NACE conditions. Despite the more aggressive nature of the test solution in these cases, no samples of either steel suffered failure.

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Section: Haz Hardness and Tensile Propertiessupporting

confidence: 87%

High-strength steel development for pipelines: A brazilian perspective

Bott

Souza

Teixeira

et al. 2005

Metall Mater Trans A

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“…For the PSL2 level, the CE value is one of the main requirements in relation to the weldability of the material. In the present study, the carbon content (C < 0.2%) and CE indicate a region of good weldability in "Granville diagram" (chart relating the carbon content with carbon equivalent, indicating regions of weldability: good, with special care, and low) for HSLA and API steels 39,40 . Another important point to be considered is the presence of vanadium (0.02%V) in the chemical composition of the steel, an element added mainly for precipitation strengthening and microstructure refinement.…”

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confidence: 46%

Evaluation of Microstructure and Mechanical Properties of Seamless Steel Pipes API 5L Type Obtained by Different Processes of Heat Treatments

2017

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This research presents the influence of manufacturing processes and heat treatments on the resulting microstructures and mechanical properties of an API 5L PSL2 seamless steel pipe. Three different conditions are considered -as rolled, normalized and quenched and tempered -to obtain the grades X42R, X42N and X70Q, respectively. Scanning electron microscopy techniques was used to characterize the resultant microstructures. Tensile, hardness, impact, fracture toughness (J integral) and fatigue crack growth tests (da/dN x ΔK) were used to study the materials mechanical behavior. The results show the possibility of achieving API grades for a seamless pipeline steel, through suitable heat treatments. The microstructural modifications and mechanical properties changes observed showed a remarkable structure-properties relationship of the steel, and attempt to a proper selection as required by the structural design. The quenching and tempering process increased tensile mechanical properties and fracture toughness, but combined to a significant decrease in fatigue crack growth resistance.

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“…The heat input used in the welding should be restricted to lower range. Because of slower cooling rate at higher heat input, microstructure of weld metal and HAZ changes, coarsening of prior austenite grain and precipitation of undesirable hard phases take place leading to the deterioration of tensile strength and impact toughness (Dixon and Hakansson 1995;Dhua et al 2002).…”

Section: Introductionmentioning

confidence: 98%

“…In industrial production, welding technique having high efficiency and quality as well as low cost, labour intensity and energy consumption is found to be very important in the welding of steel structures. While welding technology without pre or post heat treatments is considered to be important in this direction (Spanos et al 2001;Dhua et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Characterization on strength and toughness of welded joint for Q550 steel

Jiang

Wang

et al. 2011

Bull Mater Sci

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Q550 high strength steel was welded using gas shielded arc welding and three different welding wires without pre-or post-heat treatments. The paper investigates the influence of welding wire on the microstructure, tensile strength and impact toughness of Q550 steel weld joints. Results showed that the microstructure of the weld metal of joints produced using ER50-6 wire was a mixture of acicular ferrite and grain boundary ferrite including pro-eutectoid ferrite and ferrite side plate. Acicular ferrite was mainly obtained in the weld metal of the joints produced using MK·G60-1 wire. Pro-eutectoid ferrite was present along the boundary of prior austenite. Crack initiation occurred easily at pro-eutectoid ferrite when the joint was subjected to tensile. Tensile strength and impact toughness were promoted with increasing acicular ferrite. Tensile strength of the joint fabricated using MK·G60-1 wire was close to that of base metal. And tensile samples fractured at location of the fusion zone, which had lower toughness and thus became the weak region in the joint. Impact absorbing energy was the highest in the heat affected zone. Fibrous region in fracture surfaces of impact specimens was characterized as transgranular fracture with the mechanism of micro-void coalescence. Acicular ferrite microstructure region corresponded to relatively large dimples while boundary ferrite microstructure corresponded to small dimples.

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Weldability and Microstructural Aspects of Shielded Metal Arc Welded HSLA-100 Steel Plates.

Cited by 37 publications

References 17 publications

High-strength steel development for pipelines: A brazilian perspective

High-strength steel development for pipelines: A brazilian perspective

Evaluation of Microstructure and Mechanical Properties of Seamless Steel Pipes API 5L Type Obtained by Different Processes of Heat Treatments

Characterization on strength and toughness of welded joint for Q550 steel

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